[PATCH net-next 0/3] net: ipv4/ipv6: new option to accept garp/untracked na only if in-network

From: Jaehee Park
Date: Mon Jul 11 2022 - 13:51:22 EST

The first patch adds an option to learn a neighbor from garp only if
the src ip is in the same subnet of addresses configured on the
interface. The option has been added to arp_accept in ipv4.

The same feature has been added to ndisc (patch 2). For ipv6, the
subnet filtering knob is an extension of the accept_untracked_na
option introduced in these patches:

The third patch contains selftests for testing the different options
for accepting arp and neighbor advertisements.

Jaehee Park (3):
net: ipv4: new arp_accept option to accept garp only if in-network
net: ipv6: new accept_untracked_na option to accept na only if
selftests: net: arp_ndisc_untracked_subnets: test for arp_accept and

Documentation/networking/ip-sysctl.rst | 48 +--
include/linux/inetdevice.h | 2 +-
net/ipv4/arp.c | 24 +-
net/ipv6/addrconf.c | 2 +-
net/ipv6/ndisc.c | 29 +-
tools/testing/selftests/net/Makefile | 1 +
.../net/arp_ndisc_untracked_subnets.sh | 281 ++++++++++++++++++
7 files changed, 360 insertions(+), 27 deletions(-)
create mode 100755 tools/testing/selftests/net/arp_ndisc_untracked_subnets.sh